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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
According to NASM's Essentials of Corrective Exercise Training the dynamic stabilizers of the glenohumeral joint is dependent on the musculature that surrounds the joint, including the rotator cuff and scapular stabilizers.. The key muscles associated with the shoulder are: 1. Supraspinatus. 2.